Bag filling machine



March 29, 1932. K. MlDDELBoE BAG FILLING MACHINE 2 Sheets-Sheet FiledJan. 4, 1930 March 1932. K MiDDELBOE 1,851,017

BAG FILLING MACHINE Filed Jan. 4, 1930 2 Sheets-Sheet 2 INVENTOR www@Patented Mar. 29, 1932 KRISTEAN MIDDLBOE, 0F FEDERKSBEHG, CONHAG-EN,DENMARK, AS-

SGNOR T0 F. L. SMIDTH 8c C0., OF NEW YORK, N. Y.,

JERSEY a CORPORATION or NEW 'BAG FILLENG MACHINE Application led January4, 1930, Serial No.

This invention relates to machines for lilling bags with freely flowingpulverulent material, such as cement,and more especially to machines ofthis general character in which the bags are filled through spouts whichare introduced within the bags. Such machines are commonly used for thefilling of self-closing bags, known as Vvalve bags, but the presentinvention is applicable to the filling of bags whether or not they areof the self-closing type. ln another applica-tion for Letters Patent ofthe United States Serial No. 305,221, liled September 11, 1928, there isshown and described a machine of this general character in which the bagto be filled is held upon and supported by the filling spout during theoperation of filling and is released therefrom when the predeterminedquantity of material has been delivered into the bag. In thatconstruction the lilling spout is carried by one arm of acounter-balanced lever and a means is provided whereby, when the desiredquantity of material has entered the bag, the lever is caused to swingon its axis and the inclination of the supporting part of the fillingspout is increased suiiciently to permit the bag to slip from the spout.There is also provided a clamping device or presser by which, during thefilling operation, the bag is clamped between the presser and the illingspout and when the supporting lever is swung upon its axis the spout ismoved away from the presser so that the bag shall be free to slip fromthe spout, a means being provided to dislodge the bag from the-inclinedportion of the spout. The dislodging means is shown in that case asstriker which is arranged to be brought into contact with the bag at theproper time, preferably at the bottom of the bag near the corner, theeffect of the striker being to cause the bag, the filling spout, and thesupporting lever to swing about the axis of the lever, therebyincreasing the inclination of the spout and insuring the dislodgment ofthe bag therefrom. In accordance with the present invention the lillingspout, during the operation of lilling, is held against movement withthe bag clamped between itself and the presser, but when thepredetermined weight of 418,514, and. in Hungary January 14, 1929.

material has been introduced intothe bag the lilling spout is releasedand, under the inliuence of, gravity, the filling spout, with the filledbag, swings to such position that the bag will slip from the fillingspoutwithout the intervention of any other means. The rele se anddischarge of the filling bag is thus eli'ected automatically. Toaccomplish this result, there is combined with the lilling spout and itssupport a weighing mechanism which, when the predetermined weight ofmaterial has been introduced into the bag, initiates the operation cfthe releasing device.

rlhe invention will be more fully explained hereinafter with referenceto the accompanying drawings in which it is illustrated, and in which:

lJigure 1 is a view in sectional elevation of a machine in which theinvention is embodied, the bin from which the material is supplied beingpartly broken out to save space.

Figure 2 is a view in horizontal section on the plane indicated by thebroken line 2-2 of higure 1, looking in the direction of the arrows.

Figure 3 is a detail view in section on the plane indicated by thebroken line 3-3 of Figure 2, looking in the direction of the arrows,illustrating particularly the application of av spring to the slide orgate by which the liow of the material from the bin is permitted orstopped.

Figure e is a detail view in sectional elevation and on a larger scale,on the plane indicated by the broken line '-l-a of Figure 1,illustrating particularly the presser or clamping device.

The bin a, from which the material is supplied to the bags to be filled,is shown as having at al an outlet for the discharge of the material,the delivery of the material being controlled by a gate b, pivoted onthe bottom of the bin, as at b3, so that it may swing in a horizontalplane and provided, Yas shown at b2 in Figure 3, with a. torsion springwhich tends to close the gate when it is released.

T he material falls from the outlet a1 through a funnel b4 into theflared upper-end of the filling spout L, which is substantially L-shapedand is supported by a lever L1 y travel in slots K4 of the -main frame.

which is pivoted, as at L2, on a cross-rod between the two members of asuspension rod J1 which hangs from Vone end of a balance lever J2 fromthe other Vend of which hangs a weight rod J, at the lower end of whichare hung the weights J3 which counterbal ance the weight of a bag p andits contents until the bag is filled to such a weight that itover-balances the weights` J 3-, whereby are initiated the operations tobe described.v

The filling spout is shown in Figure l in the position which it assumesduring the operation of filling and it is permitted only in acounter-clockwisedirection,v asseen in Figure l, being restrained frommovement in the opposite direction by a bracket J t, supported by themembers of the suspension rod J1.AV AV counter weight n kis supported bybracket arms J 5: on the opposite side of` the suspension rodJ1 from thefilling spout. n It will be Vobserved that while the suspension rod ishung atV its upper end from the balance Vlever J2 and is capable ofmovement Vin a vertical direction, it is held from swinging to theright, Linder the inuence of the weight of the filled bag, by radiusrods R, which have their bearings at s and s1, as

shown in FigureV l. The bag p to be filled is slipped upon the lowerarmv ofthe filling spoutV when the latter is swung upon the'axis 'L2 ina clockwise direction when the filling spout has been tilted todischargethefiiled bagandthe machine is tobe set for the filling of an empty bag.l/Vhen the bag has been i placed in `positionon the filling spout thelatter is swung to the position shown in Figure l and-is there held, thebag being clamped between the lower arm of the filling spout and thepresserl K; The latter is supported by arms K1 from the lower ends ofthe two inemvbers of the suspension rod; J1 andcomprises a plunger K2which is shaped at its lower end to conform to the filling. spout L. Theplunger, supported-in the main frame of the presser, is presseddownwardf byspring-K4L andits movement is limited by pins K3 whih 57this Vmeans variations in thickness of thebags andfslight' relativemovements ofthe lling spout are compensated-for and the bag held Y fromaccidentaldislodgmentduring the filling operation. v

l *The filling spout is so proportionedthat the'center ofV gravity ofthebag and its contents, during the operation of filling, is offset to theleft, as shown in Figure l, andv the supporting lever L1, rwith thefilling'spout, must therefore be locked, during the operation of`filling, against swinging` upon the axis L2. Accordingly, the leverL1 isextended upward fromitsl axis L2 and is provided witha stop L3, theymovement of which to the left during the opera-tionfof filling isprevented by a detentm3 which isi-carried..v by the shaft V,axis ofy atripper 'armA or lever-m1.

to swing The lever m1 is connected at its upper-end with the gate Z)through a chain bz2-and anV arm h1 on the gate b, so that when the gateZ) is moved to a position to permit the flow of material from the binintothe filling spout the lever m1 will be moved from theposition shownby broken lines in Figure l to the position shown by full lines and thedetent m3 will be in such relation to the stop L3 of the Y .lever L1that movement of the lever L1 and Vtherefore of the filling spout L willbeprevented. VOn theV other hand,cwhen thev gate 7) is moved to theposition shown by broken linesyinAv Figure 2.,'to cut off the'flfow ofmaterial, the arm b1 of the lever b will strike the lever m1- and willcause it to move from 'soY the full line position of Figurel tothebroken v line position, thereby taking the detent m3 out of the pathVof movement of the stop L3 andV permitting the filling spout to swing ina counter-clockwise direction under the influence ofthe unbalancedweight of the bag and its contents. The Ysha-ft' axis of' the lever m1is provided with an armm which cooperates with a stop J 7Vtol limit themovement of the lever. Y Y The gate o is moved from its closedAposition, shown by broken lines .in Figure 2, to its open position shownby fullv lines in. that ligure against thetension of the spring b2, by awire d. which connects the gate. with a lever e which ispivoted on theframe of the machine and has an arm-e-1 and an arme2. In theclosedposition of thegate the end of the arm er1- overlies the end f2 ofiahand` lever f pivoted at f1 and .provided` with a spring which returnsit toa position of rest. llhenV the empty bag has been placed' on thefilling spoutas described, thelong arm of the-lever fis depressed andthe shortarm, contacting with the-end! ofthe arm el, swings that arm andtheleverfrom theposition shown by broken lines in Figure l to theposition shown d by full linesthereby opening the gate b and The maj orpartof the resetting,movementof the filling spout is effected bytheoperator as soon as lie-has placedthe begin position on the spout. Thecani-like coactlon ofthe detent and the stop completesthe,movement andlocks the partsin .filling position. v

After the :filled bag. has been dislodged from` thel filling spout thecounterbalance weightsY J 3 raise the suspensionrod;and` thepartsconnected therewith, including the lill; ingspout, and'pull downthe weight .rod J:

The latter carries a pin J7 Which, in the downward movement of theweight rod, contacts With the end h1 of a detent lever h, causing it tocoact with a tripper arm g of a latch g1. The latter is arranged tocoact With a yielding portion e3 of' the latch lever e2 and thereby holdthe lever e and its connected parts in the position shown by full linesin Figure 1. rlhe detent 7L is acted upon by a spring 71,3 which, Whenthe pin J7 of the Weight rod l is raised from the end h1 of the leverit, as the bag is tilled to the predetermined Weight, pulls down thecorresponding end of the detent 7L, releases the tripper arm g and soedects the release of the arm e3 and lever e and permits the gate b tobe closed by the action of the spring b2. A. spring g2 returns the arm gto position of rest against stop g3. rllhe movement of the gate to shutoil the iiow e'ects the release of the filling spout in the manneralready described and the cycle ot operations is repeated. It Will beunderstood that when the hand lever f is pulled down the Wear plate f2on the other end contacts with the arm el and swings it to the full lineposition as above described. The arm e2 is also swung to full lineposition and the yielding part e3 slips over the latch g1 so that thearm e2 is then held by the latch until it is again released by movementof the Weight rod as above described.

it will be understood that various changes in details of constructionand arrangements can be made to suit diierent conditions of use andthat, except as pointed out in the accompanying claims, the invention isnot restricted to the particular construction shown and describedherein.

l claim as my invention:

l. ln a bag filling machine, the combination ot a lilling spout adaptedto support a bag to be filled, a balanced lever, a Weight rod hung fromone end of said balanced lever, a suspension rod hung from the other endof said balanced lever, a supporting lever for the filling spout mountedon the suspension rod, a detent mounted independent-ly of the last namedlever, a detent on the last named lever engaged by the first detent toprevent movement of said supporting lever, and means the operation ofWhich is initiated by the movement of the balanced lever to move thedetent and permit the angle of inclination oin the spout to be changedwith the movement of said lever.

2. In a bag filling machine, the combination of a bin having an outlet,and a pivotally supported filling spout, a pivoted detent to preventmovement of the spout, an arm carried by the detent, a gate to controlthe discharge oi' the material through the outlet, a balanced lever,means to support from one end of said balanced lever a bag to be filled,a Weight rod hung from the other end of the` balanced lever, meanstending normally to close the gate, means operated by the closing of thegate to engage the detent arm to release the detent and filling spout, alever operatively connected to the gate and having a detent arm, adetent to engage said arm and prevent movement of the last named lever,and means the operation of which is actuated by the movement of theWeight rod to move the detent to release the arm and lever and permitthe gate to close.

Signed at London, England this 6th day of December, A. D. 1929.

KRISTIAN MIDDELBOE.

